• Code: 025-0451-05
• Description: Toner Density Sensor (Bk) output upper limit error
• Causes: The Toner Density Sensor (Bk) detected that the output (Vsig_ind) was 221 or higher 10 consecutive times.
• Remedy: [Related parts] R1.00 - Harness between the Side Driver PCB (UN96/J1309) and the Toner Density Sensor (Bk) (TS1/ J9016) - Harness between the Video PCB (UN106/J76) and the Laser Scanner Unit (Bk) - Harness between the Developing High Voltage PCB (CL) (UN40/J3046) and the Developing High Voltage PCB (Bk) (UN39/J7) - Harness between the DC Controller PCB (UN2/J1254) and the Developing High Voltage PCB (CL) (UN40/J3045) - Harness between the DC Controller PCB (UN2/J1248) and the Hopper Toner Level Sensor (Bk) (TS5/J7136) - Toner Density Sensor (Bk) (TS1) - Hopper Toner Level Sensor (Bk) (TS5) - Laser Scanner Unit (Bk) - Developing High Voltage PCB (Bk) (UN39) - Developing High Voltage PCB (CL) (UN40) - Primary Charging High Voltage PCB (Bk) (UN37) - DC Controller PCB (UN2) - Hopper Unit (Bk) [Remedy] Check/replace the related harness/cable, connector and parts. [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 025-04A0-05
• Description: Toner Container phase detection error (Bk)
• Causes: The Toner Container Phase Sensor (Bk) did not detect the open state when opening the Toner Container Cap.
• Remedy: [Related parts] R1.00 - Harness connecting from the DC Controller PCB (UN2/J1248) to the Toner Container Reciprocation HP Sensor (Bk) and Toner Container Phase Sensor (Bk) (PS8/J1750 and PS84/ J7129) - Toner Container Reciprocation HP Sensor (Bk) (PS8) - Toner Container Phase Sensor (Bk) (PS84) - DC Controller PCB (UN2) - Developing Drive Unit (Bk) [Remedy] Perform the following in the order while checking whether the error is cleared. After performing the remedy work, go through the following to clear the error: COPIER> FUNCTION> CLEAR> ERR. 1. Check the installation of the sensor and whether it is soiled. 2. Move the Hopper Unit (Bk) little by little with the Toner Container Removing Tool, and check if the output value of "COPIER> I/O> DC-CON> P035 bit13" is changed. a. If the output value of the sensor is changed, check the gears of the Hopper Unit. If they are damaged, replace the Developing Drive Unit (Bk). b. If the output value of the sensor is not changed, check/replace the related harness/cable, connector and parts. After a recovery from the error, go through the following to check that toner can be replaced properly (the removed toner container can be installed again): "Adjustment/Maintenance> Maintenance> Replace Specified Toner". [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 025-04B0-05
• Description: Toner Container phase detection error (Bk)
• Causes: The Toner Container Phase Sensor (Bk) did not detect the close state when closing the Toner Container Cap.
• Remedy: [Related parts] R1.00 - Harness connecting from the DC Controller PCB (UN2/J1248) to the Toner Container Reciprocation HP Sensor (Bk) and Toner Container Phase Sensor (Bk) (PS8/J1750 and PS84/ J7129) - Toner Container Reciprocation HP Sensor (Bk) (PS8) - Toner Container Phase Sensor (Bk) (PS84) - DC Controller PCB (UN2) - Developing Drive Unit (Bk) [Remedy] Perform the following in the order while checking whether the error is cleared. After performing the remedy work, go through the following to clear the error: COPIER> FUNCTION> CLEAR> ERR. 1. Check the installation of the sensor and whether it is soiled. 2. Move the Hopper Unit (Bk) little by little with the Toner Container Removing Tool, and check if the output value of "COPIER> I/O> DC-CON> P035 bit13" is changed. a. If the output value of the sensor is changed, check the gears of the Hopper Unit. If they are damaged, replace the Developing Drive Unit (Bk). b. If the output value of the sensor is not changed, check/replace the related harness/cable, connector and parts. After a recovery from the error, go through the following to check that toner can be replaced properly (the removed toner container can be installed again): "Adjustment/Maintenance> Maintenance> Replace Specified Toner". [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 025-04C0-05
• Description: Toner Container Replacement Cover open/close detection error (Bk)
• Causes: The Toner Container Replacement Door Sensor (Bk) did not detect the open state when removing the Toner Container.
• Remedy: [Related parts] R1.00 - Harness between the Side Driver PCB (UN96/J1310) and the Toner Container Replacement Door Sensor (Bk) (PS7/J7138) - Toner Container Replacement Door Sensor (Bk) (PS7) - Hopper Unit (Bk) - Toner Container Replacement Cover Unit - Side Driver PCB (UN96) - DC Controller PCB (UN2) [Remedy] Perform the following in the order while checking whether the error is cleared. After performing the remedy work, go through the following to clear the error: COPIER> FUNCTION> CLEAR> ERR. 1. Go through the following to check that the Toner Container Replacement Cover opens: Adjustment/Maintenance> Maintenance> Replace Specified Toner> Replace. Not Needed> Remove Toner. 2. Check the installation of the Toner Container Replacement Door Sensor (Bk) and whether it is soiled. 3. Check that the Toner Container Replacement Cover opens by making the Hopper Unit driven with the Toner Container Removing Tool. If it's in normal state, the output value of "COPIER> I/O> DC-CON> P035 bit4" shows "0" when opening the cover, and "1" when closing it with your hand. a. When the Toner Container Replacement Cover does not open although the Hopper Unit is driven, check the drive system (Hopper Unit and link mechanism of Hopper Tray). b. If the output value is not changed properly although the Toner Container Replacement Cover can be opened/closed, check/replace the related harness/cable, connector and parts. After a recovery from the error, go through the following to check that toner can be replaced properly (the removed toner container can be installed again): "Adjustment/Maintenance> Maintenance> Replace Specified Toner". [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 026-0101-05
• Description: Developing Thermistor (Y) high temperature detection error
• Causes: The Thermistor of the Toner Density Sensor (Y) detected 70 deg C or higher.
• Remedy: [Related parts] R1.00 - Harness between the Side Driver PCB (UN96/J1305) and the Toner Density Sensor (Y) (TS2/ J8944) - Toner Density Sensor (Y) (TS2) - Developing Assembly (Y) - Side Driver PCB (UN96) [Remedy] Perform the following in the order while checking whether the error is cleared. a. If you touch the Toner Density Sensor (Y) of the Developing Assembly (Y) and it is cooled down, check/replace the related harness/cable, connector and parts. b. If you touch the Toner Density Sensor (Y) of the Developing Assembly (Y) and it is still warm, or if the error does not occur during a service visit but is found in the log: - Clean the cooling suction/exhaust fans in the developing system as well as ducts and filters. - If the space behind the host machine is less than 10 cm, ask the user to secure enough space.

• Code: 026-0102-05
• Description: Developing Thermistor (Y) low temperature detection error
• Causes: The Thermistor of the Toner Density Sensor (Y) detected 35 deg C or lower.
• Remedy: [Related parts] R1.00 - Harness between the Side Driver PCB (UN96/J1305) and the Toner Density Sensor (Y) (TS2/ J8944) - Toner Density Sensor (Y) (TS2) - Developing Assembly (Y) - Side Driver PCB (UN96) [Remedy] Check/replace the related harness/cable, connector and parts.

• Code: 026-0201-05
• Description: Developing Thermistor (M) high temperature detection error
• Causes: The Thermistor of the Toner Density Sensor (M) detected 70 deg C or higher.
• Remedy: [Related parts] R1.00 - Harness between the Side Driver PCB (UN96/J1305) and the Toner Density Sensor (M) (TS3/ J9014) - Toner Density Sensor (M) (TS3) - Developing Assembly (M) - Side Driver PCB (UN96) [Remedy] Perform the following in the order while checking whether the error is cleared. a. If you touch the Toner Density Sensor (M) of the Developing Assembly (M) and it is cooled down, check/replace the related harness/cable, connector and parts. b. If you touch the Toner Density Sensor (M) of the Developing Assembly (M) and it is still warm, or if the error does not occur during a service visit but is found in the log: - Clean the cooling suction/exhaust fans in the developing system as well as ducts and filters. - If the space behind the host machine is less than 10 cm, ask the user to secure enough space.

• Code: 026-0202-05
• Description: Developing Thermistor (M) low temperature detection error
• Causes: The Thermistor of the Toner Density Sensor (M) detected 35 deg C or lower.
• Remedy: [Related parts] R1.00 - Harness between the Side Driver PCB (UN96/J1305) and the Toner Density Sensor (M) (TS3/ J9014) - Toner Density Sensor (M) (TS3) - Developing Assembly (M) - Side Driver PCB (UN96) [Remedy] Check/replace the related harness/cable, connector and parts.